Warning: session_start(): open(/var/lib/php5/sess_f0oeo5uck9535qc0vjj0cb99e2, O_RDWR) failed: No space left on device (28) in /var/www/clicktotweet.com/www/index.php on line 5 Sequoia Capital, WhatsApp's only investor, made $2.4 billion or enough to buy 17 of Tom Perkins' yachts. http://bit.ly/1e8PsC8